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How do I clean an oil tank?

Hey guys,

I'm not a oil burner tech by any stretch of the imagination. This is why I got rid of the old oil furnace and hot water tank in the house I just purchased. Allready had natural gas pulled and have installed the variable speed, modulating furnace and the instantaneous hot water heater. Now I'm left with my, empty, oil tank. Local recycler will only take it if it's been cut in half and cleaned. How do you clean an oil tank, any special poducts, any advice would be appreciated.

We go through Energy Kinetics System 2000 filters at a rate that means I should own stock in the manufacturer. We believe our oil tends to be dirty, and have been told that it might be sludge and other growth in the tank (only 7 years old, inside a basement dual tank setup).

No-one seems to know how to clean a tank, or what additive I can even add on this.....

So, is there a way to
1) CLean a tank that has become sludged-up?
2) CLean a tank that is about to be removed?
3) additive to help existing problem until we remove oil completely?

We go through Energy Kinetics System 2000 filters at a rate that means I should own stock in the manufacturer. We believe our oil tends to be dirty, and have been told that it might be sludge and other growth in the tank (only 7 years old, inside a basement dual tank setup).

No-one seems to know how to clean a tank, or what additive I can even add on this.....

So, is there a way to
1) CLean a tank that has become sludged-up?
2) CLean a tank that is about to be removed?
3) additive to help existing problem until we remove oil completely?